convex_hull

THE RISK

Low Risk

Why convex_hull needs a policy

Convex hull computation is a pure geometric read operation that retrieves derived spatial information from existing geometry. It has no side effects: it does not create, modify, delete data in a persistent store, execute arbitrary commands, or commit financial transactions. The blast radius of misuse is minimal—an agent could waste computational resources but cannot damage systems or data.

From the tool's definition Tool 'convex_hull' calculates the convex hull of a geometry — a computational operation that derives a geometric boundary from input geometry without modifying, deleting, or executing arbitrary code.

Documented attack patterns abuse exactly the kind of access convex_hull gives an agent:

POLICY

How to control convex_hull

PolicyLayer is an MCP gateway — it sits between your AI agents and GIS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for convex_hull:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "convex_hull": {}
  }
}

convex_hull is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register GIS MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

More GIS MCP Server tools

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All 98 GIS MCP Server tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about convex_hull

What does the convex_hull tool do? +

Calculate convex hull of a geometry. It is categorised as a Read tool in the GIS MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on convex_hull? +

Register the GIS MCP Server MCP server in PolicyLayer and add a rule for convex_hull: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches GIS MCP Server. Nothing to install.

What risk level is convex_hull? +

convex_hull is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit convex_hull? +

Yes. Add a rate_limit block to the convex_hull rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block convex_hull completely? +

Set action: deny in the PolicyLayer policy for convex_hull. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides convex_hull? +

convex_hull is provided by the GIS MCP Server MCP server (mahdin75/gis-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every GIS MCP Server tool call.

Start from GIS MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →